But, I once read (and I thought that it was on here) about a study that was done to show the actual reliability (or lack there of) of herd immunity in the US.

It was a bunch of statistics about how herd immunity couldn't work because of the number of children/immigrants/newborns that aren't vaccinated, AND because of the number of adults who haven't received boosters for shots that don't have lifelong immunity.

Anyone??

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Part-time adjunct professor and single Mama to 3 year old b/g twins .

Pubmed is the place to go for studies. When I searched for "herd immunity" in pubmed, I got 1000+ results (and 215 with free full-text available, so you don't need to go to the library).

I don't know what anyone could conclude from guessing how many immigrants are unvaccinated or whatever. As for boosters, the only booster recommended for adults at the moment is Tdap. Most other vaccines we received as kids result in immunity that is life-long, or pretty close to it. There are better ways to measure whether herd immunity is effective - like seeing how vaccinating a population affects disease rates in unvaccinated segments of the population. For example:

I found the same 1200 articles, and started paging through, but could only find articles about why herd immunity works. I suspect you're looking for a needle in a haystack (if it even exists), so I gave up. Looks like OP did too.